#include "univ.i"
#include "row0types.h"
#include "data0types.h"
#include "mem0mem.h"
#include "dict0types.h"
#include "row0ext.ic"

Include dependency graph for row0ext.h:

Data Structures
struct	row_ext_t

Functions
UNIV_INTERN row_ext_t *	row_ext_create (ulint n_ext, const ulint ext, ulint flags, const dtuple_t tuple, mem_heap_t *heap)
UNIV_INLINE const byte *	row_ext_lookup_ith (const row_ext_t ext, ulint i, ulint len)
UNIV_INLINE const byte *	row_ext_lookup (const row_ext_t ext, ulint col, ulint len)

Detailed Description

Caching of externally stored column prefixes

Created September 2006 Marko Makela

Function Documentation

UNIV_INTERN row_ext_t* row_ext_create	(	ulint	n_ext,
		const ulint *	ext,
		ulint	flags,
		const dtuple_t *	tuple,
		mem_heap_t *	heap
	)

Creates a cache of column prefixes of externally stored columns.

Parameters

n_ext	in: number of externally stored columns
ext	in: col_no's of externally stored columns in the InnoDB table object, as reported by dict_col_get_no(); NOT relative to the records in the clustered index
flags	in: table->flags
tuple	in: data tuple containing the field references of the externally stored columns; must be indexed by col_no; the clustered index record must be covered by a lock or a page latch to prevent deletion (rollback or purge).

UNIV_INLINE const byte* row_ext_lookup	(	const row_ext_t *	ext,
		ulint	col,
		ulint *	len
	)

Looks up a column prefix of an externally stored column.

Returns: column prefix, or NULL if the column is not stored externally, or pointer to field_ref_zero if the BLOB pointer is unset out: length of prefix, in bytes, at most the length determined by DICT_MAX_FIELD_LEN_BY_FORMAT()

Looks up a column prefix of an externally stored column.

Returns: column prefix, or NULL if the column is not stored externally, or pointer to field_ref_zero if the BLOB pointer is unset

Parameters

ext	in: column prefix cache
col	in: column number in the InnoDB table object, as reported by dict_col_get_no(); NOT relative to the records in the clustered index
len	out: length of prefix, in bytes, at most ext->max_len

UNIV_INLINE const byte* row_ext_lookup_ith	(	const row_ext_t *	ext,
		ulint	i,
		ulint *	len
	)

Looks up a column prefix of an externally stored column.

Returns: column prefix, or NULL if the column is not stored externally, or pointer to field_ref_zero if the BLOB pointer is unset out: length of prefix, in bytes, at most the length determined by DICT_MAX_FIELD_LEN_BY_FORMAT()

Looks up a column prefix of an externally stored column.

Returns: column prefix, or NULL if the column is not stored externally, or pointer to field_ref_zero if the BLOB pointer is unset

Parameters

ext	in/out: column prefix cache
i	in: index of ext->ext[]
len	out: length of prefix, in bytes, at most ext->max_len